Valve



S. HAIGH.

(No Model.)

VALVE.

Patented Feb. l5, 1898.

i NITED STATES ATENT rines.

SAMUEL Innen, or ciNcINNATI, oHIo.

VALVE.

SPECIFICATION forming part of Letters Patent No. 599,059, dated February `15, 1898.

Application lecl March 2 9, 1 8 9 7.

' where they are subject toexcessive wear-as,

for example, Where used'as blow-off cocks for steam-boilers.

To this end the invention consists in the improved stop-cock constructed as hereinafter set forth.

Mechanism embodying my invention is illustrated in the accompanying drawings, in which- Figure l is an axial sectional elevation of my improved valve, taken across the line of transmission; Fig. 2, a similar section taken in the line of transmission, and Fig. 3 a hori- Zontal cross-section in the axis of the transymission-passage.

Referring now to the drawings,A designates the outer casing of a cock o'r valve having transmission-passages a co2 leading to and from the same. Within said casing is a rotating plug or bushing B, fitted to a slightlyconical seat and provided with a verticallyelongated rectangular passage b, registering with similarly-formed ports a3 a4 at opposite sides of the casing A. The plug is fitted at its lower terminus with a nut a5 and the usual washers, dac., to hold it to its seat, and asv thus far described the parts do not materially differ from the ordinary construction, except that the plug is a little longer than is usual.

From the top of the plug downward to a point below the bottom of the lateral passage b the plug is provided with an axial circular aperture or recess of somewhat greater diameter thanthewidth of the passage b. The upper end of said recess is countersunk, forming an annular shoulder b. Within the axial recess thus formed is fitted a piston or plunger c, of sufficient length to completely fill said recess across the zone of the passage b sain no. 629,742. (No man.)

and adapted to slide up and down in said reand beyond this into a cylindrical head d2,

with a squared terminal d3. The stem c is held in place by an annular cap or plug e, fitting the cylindrical head cl2 exteriorly and itself threaded into the countersunk enlargement of the plug and bearing against the ange cl', which is thus held against the shoulder b and permitted to rotate freely without vertical movement.

The plunger c is'prevented from rotating oy a slot-and-feather engagement with a pin p, projecting at the inside of the plug B, and being so prevented from rotation is moved up and down by the rotation of the screw-stem d. A gasket or packing-Washer upon the shoulder h prevents leakage.

As thus constructed, the parts are fully operative. W'hen the plunger c is raised, the passage is beneath it to the extent of its elevation. The plug B when opened is always opened to the full extent, so that its passage b stands in line withthe ports of passages a a2. v The degree of opening, however, is regulated by the plunger c. Thus the passages Stand in line and all wear is equal and does not tend to enlarge the ports by wear at the edges. The only cross-wear is taken at the bottom of the plunger c, which does not affect the general action or lessen its eciency.

In addition to these features and to insure tight seating of the pistou-valve c I prefer to construct it as follows: The piston on cis completely divided longitudinally at one side, as shown in Fig. 3, and may thus iit in its inclosing recess or chamber in a state of slight compression, thus insuring a tight seating. At the bottom it may also be coned interiorly, as shown in Fig. l, and in reaching its lowest position seats upon a conical spreader s, by which, should the parts become worn by use, it is expanded to a tighter it, effectually preventing any, possible leakage. The spreader may be, as shown, a conical-headed bolt inserted through the bottom of the plug.

IOO

An oiling-passage t may be provided through the head d2, inclined outwardly of the screwstem d, passing through the zone of the flange d', as shown in Fig. l in dotted lines.

lVhile I have shown a rotating screw-stem as a means of raising and lowering the piston c, I do not confine myself to such means exclusively.

I claim as my invention and desire to secure by Letters Patent of the United Statesl. In a Valve ofthe character indicated the combination of a casing; a rotating plug-valve having a relatively narrow and vertically-extended opening through the same, coinciding with the lead and discharge openings of the casing; a supplemental non-rotating pistonvalve seated in an axial perforation of the plug-valve intersecting said opening and of greater diameter than the Width of the same, and a rotating stem threaded axially in said piston-valve and extended outwardly through the plu g-valve and held against vertical movement, substantially as set forth.

2. In a rotating plug-valve of the character indicated the combination of the laterally and vertically perforated conical turning plug, the vertically-adjustable non-rotating piston-plunger seated in the axial and controlling the lateral perforation of the conical plug, the threaded screw-stem seated in said plunger, and provided with a flange seated upon a shoulder of the vertical perforation of the plug, and the stufng-box seated -in the perforation of the plug and upon the ange of the stem, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses.

SAMUEL HAIGI-I. \Vitnesses:

VL. M. HOSEA,

HERBERT J. ALLSUP. 

